File Scrubber in Python 36

#!/usr/bin/python3
from os.path import isfile, getsize
from os import remove
from secrets import randbits
from math import floor

filename: str
while True :
    filename = input('File: ')
    if filename.lower().strip() in ('', 'none', 'quit') :
        exit()
    elif isfile(filename.strip()) :
        filename = filename.strip()
        print()
        break
    else :
        print('\a')

iterations: int
while True :
    try :
        iterations = int(input('Number of iterations: ').strip())
        assert iterations > 0
        break
    except :
        print('\a')

file_size: int
try :
    file_size = getsize(filename)
except :
    print('No access.')
    exit()

for x in range(iterations) :
    y = floor(x / iterations * 100)
    print(f"{y:>02}%\r", end='')
    try :
        file = open(filename, 'wb+')
        file.write(bytes(randbits(8) for _ in range(file_size)))
    except :
        print('Access interrupted on {}%.'.format(y) if x else 'No access.')
        exit()
    finally :
        try :
            file.close()
        except NameError :
            pass

try :
    file = open(filename, 'rb')
    read = file.readall()
    file.close()
    #
    file = open(filename, 'wb+')
    file.write(bytes(randbits(8) ^ read[x] for x in range(file_size)))
    file.close()
    #
    remove(filename)
except :
    print('No access.')
    exit()
finally :
    try :
        if not file.closed : file.close()
    except :
        pass

print('Done.')